In his book, "Save the Cat", Blake Snyder describes how to write a good movie screenplay.
One of his pieces of advice has to do with the theme of the movie (what the movie is about). He says it's helpful if the movie is the 'same thing,...only different.' The idea is if someone is considering what movie to go watch, he needs to be able to fit it into his mental map of the type of movie it is, before he'll go see it.
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Same thing,...only different!
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